CAT → Parquet Extractor for Spanish Cadastral CAT files

Spanish Cadastral (.CAT) Fixed-Width to Parquet CLI Tool

CLI tool to transform Spanish Cadastral (.CAT) fixed-width files into optimized Parquet datasets using PyArrow.

Features

• Chunked streaming processing (memory efficient)

• Fixed-width parsing based on official cadastral specifications

• Schema consistency enforced via PyArrow

• CLI-driven execution (argparse-based)

• Snappy-compressed Parquet output

• Designed for large-scale national datasets

Installation

git clone https://github.com/miguelfreb/SECCAT2PARQUET.git

cd SECCAT2PARQUET

pip install -r requirements.txt

Usage

python src/cat_extract.py --input-folder /path/2/cat --table 11 --output table11.parquet

Supported Tables

All tables available from SEC services are supported:

11, 13, 14, 15, 16, 17

Structured according to official documentation:

https://www.catastro.hacienda.gob.es/documentos/formatos\_intercambio/catastro\_fin\_cat\_2006.pdf

Performance

Tested on full national dataset:

~250GB raw CAT files to ~9GB optimized Parquet output

Stable memory footprint due to chunked streaming

Author

Miguel Ángel Freijedo